圆锥形木块沿着它的高切开

  • 时间:2020-05-23 15:41:47
  • 分类:数学世界
  • 阅读:79 次

把一个底面直径是27cm,高9cm的圆锥形木块,沿着它的高切开,分成形状和大小都相同的两个木块后,表面积比原来增加了多少平方厘米?

数学题解答:圆锥沿着高切开后,得到形状、大小都相同的两个部分,那么切口那里就得到了两个等腰三角形,三角形的底是27CM(即圆锥的底面直径),高是9CM(即圆锥的高),可以很容易地算出它们的面积之和,也就是增加的表面积。

27×9÷2×2=243(平方厘米)或者直接写:27×9=243(平方厘米)

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